reference. It also may be at the same physical location but is usually at another (remote) site.
Revertive
A protection switching mode in which, after a protection switch occurs, the equipment returns to
the nominal configuration (that is, the service equipment is active, and the protection equipment
is standby) after the clearing of any failure conditions that caused a protection switch to occur
or after any external switch commands are reset. See Non-Revertive.
Ring
A configuration of nodes comprised of network elements connected in a circular fashion. Under
normal conditions, each node is interconnected with its neighbor and includes capacity for
transmission in either direction between adjacent nodes. Path switched rings use a head-end
bridge and tail-end switch. Line switched rings actively reroute traffic over a protection line.
RTRV
Retrieve
RU
Rack Unit
RZ
Return to Zero
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S
SA
Service Affecting
SD
Signal Degrade
SEFS
Severely Errored Frame Seconds
Self-Healing
Ring architecture in which two or more fibers are used to provide route diversity. Node failures
only affect traffic dropped at the failed node.
Service
The operational mode of a physical entity that indicates that the entity is providing service. This
designation will change with each switch action.
SES
Severely Errored Seconds
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G L O S S A R Y
G L - 2 2
Lucent Technologies
365-372-333 R2.1
Issue 4, June 2005